Mail Headers about laravel-mailjet HOT 3 CLOSED

class Email extends Mailable
{

    /**
     * @var array
     */
    private $config;


    /**
     * Email constructor.
     *
     * @param array $config
     */
    public function __construct(array $config)
    {
        $this->config = $config;
    }


    public function build()
    {

        // Set Custom Headers 
       $this->withSwiftMessage(function ($message)  {
             $headers = $message->getHeaders();
             $headers->addTextHeader('X-MJ-CustomID', 'uuid');
       });

        $this->subject($this->config[ 'subject' ]);

        if (isset($this->config[ 'from' ])) {
            $this->from($this->config[ 'from' ], $this->config[ 'name' ]);
        }

        if (isset($this->config[ 'attachment' ])) {
            $data = base64_decode($this->config[ 'attachment' ][ 'data' ]);
            $name = $this->config[ 'attachment' ][ 'name' ];
            $mime = $this->config[ 'attachment' ][ 'mime' ];
            $this->attachData($data, $name, [ 'mime' => $mime ]);
        }

        if (is_array($this->config[ 'content' ])) {
            $this->with($this->config[ 'content' ]);
        } else {
            $this->with('content', $this->config[ 'content' ]);
        }

        return $this->view($this->config[ 'template' ]);
    }
}

        Mail::to($this->config[ 'destination' ])->send(new Email($this->config));